zehnt
tenth
The ordinal number corresponding to the number 10, indicating a position in a sequence.
Er kam als zehnter Läufer ins Ziel.
He crossed the finish line as the tenth runner.

tenth
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tenth
The ordinal number corresponding to the number 10, indicating a position in a sequence.
Er kam als zehnter Läufer ins Ziel.
He crossed the finish line as the tenth runner.

The ordinal number 'zehnt' (tenth) is derived from the cardinal number 'zehn' (ten). The suffix '-t' is used for most ordinal numbers between 2 and 19.
Aus vier wird viert, aus sechs wird sechst.
Vier (four) becomes viert (fourth), sechs (six) becomes sechst (sixth).
When 'zehnt' (tenth) is used as part of a date with the preposition 'am', it must be declined and takes the ending '-en'.
Mein Geburtstag ist am zehnten März.
My birthday is on the tenth of March.
The construction 'zu' + ordinal number is used to describe the number of people in a group. The form remains unchanged.
Wir waren zu zehnt auf der Party.
There were ten of us at the party.
ten
'zehn' and 'zehnt' look similar and both belong to the number 10. You use 'zehn' for counting: 'zehn Euro' (ten euros), 'zehn Minuten' (ten minutes), 'zehn Personen' (ten people). You use 'zehnt' for an order or sequence, for example 'der zehnte Tag' (the tenth day) or 'die zehnte Frage' (the tenth question). There is also the form 'zu zehnt' when a group of ten people does something together. So the risk of confusion is that 'zehn' states the quantity, while 'zehnt' usually indicates the position in a sequence.

Sie ist heute die zehnte Kundin im Büro.
She is the tenth customer in the office today.
Beim Arzt wartet die Verkäuferin schon seit zehn Minuten.
At the doctor's office, the saleswoman has already been waiting for ten minutes.